Respiratory mask



FIG. 1 is a perspective view of a respiratory mask showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and

FIG. 8 is second perspective view showing the respiratory mask; and,

FIG. 9 is a perspective view showing the respiratory mask in use.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a respiratory mask, as shown and described. 